Heat-detector



(No Model.)

H. RUETSGHI.

HEAT DETECTOR.

N0. 591,143'. Patented Oct. 5,1897.

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HEB Q IANN RUETSGHI,

ATTORNEY rue NORRIS vnzns 00:. Pno'ro-uwm WASHINGTON, r: c

NITED STATES PATENT OFFICE.

TIERMANN RUETSCI-II, OF NEWVARK, NEW JERSEY.

HEAT-DETECTO R.

SPECIFICATION forming part of Letters Patent No. 591 ,143, dated October5, 1897.

Application filed March 25, 1897.

To aZZ whom it may concern.-

Be it known that I, HERMANN BUETsoHr, a citizen of the United States,and a resident of Newark, in'the county of Essex and State of NewJersey, have invented a certain new and useful Heat-Detector, of whichthe following is a specification.

My invention has reference to improvements in that class ofcircuit-cl0sers in which contact is made or broken by excessive heat,and a consequent rise in temperature, by the sounding of an alarmarranged in the circuit in which the circuit-closing device is placed.

The main object of my invention, therefore, is to provide a device ofthis nature to be used as atemperature-indicator, serving, for instance,when-there is a rise in the temperature caused by a fire in the buildingas an automatic indicator to warn the person or persons in the buildingby the sounding of an electric alarm-signal.

The device is also designed foruse in greenhouses, incubators, 850., orin factories, where an even temperature is required, the device servingas an automatic indicator to give notice when the temperature is abovethat desired.

A further object of the invention is to provide in connection with theapparatus a simple means for rendering the device adjustable for thepurposes for which it is intended.

The invention consists in the improved circuit-closer hereinafter setforth, and also in the novel arrangements and combinations of theseveral parts more fully described in the accompanying specification andfinally embodied in the clauses of the claim.

The invention is illustrated in the accompanying drawings, in whichFigure 1 is aview of the device inclosed in an ornamental casing,illustrated in a circuit containing a battery and an electric alarmbell.Fig. 2 is a face view of the circuitcloser, the said ornamental casingbeing removed to more clearly show the arrangement of the several partsof the device. Fig. 3 is a side view of the device, and Fig. 4 is alongitudinal section taken on line 4 4c in said Fig. 2. Fig. 5 is an endview of the device; and Fig. 6 is a cross-section of the same,taken online 6 6 in Fig. 4.- Fig. 7 is aperspective Serial No. 629,270. onmodel.)

View of a spring employed in connection with the device provided with acontact portion which causes the circuit connected with the device to beclosed when there is an excessive rise of temperature.

Similar letters of reference are employed in all of the above-describedviews to indicate like parts.

In said drawings, A indicates the contact or circuit-closer, providedwith a suitablyornamented cover I), of metal or any other suitablematerial, provided with perforations or holes, as Z), to permit the heatto more quickly come in contact with the operative parts of thecircuit-closing device within said casing. The said circuit-closingdevice proper consists, essentially, in the arrangement of twoparallelbars a and a, of wood, slate, or any other desirable material,which may be provided with suitable openings, as a Said bars a and a areplaced side by side in such a manner as to form a longitudinal space abetween them, which is formed by the arrangement of metallic plates orblocks 0 and c, secured between said bars at or near the ends thereof bymeans of suitable screws 0 as clearly shown in Figs. 4: and 5. Said barsa and a are secured together, with the said metallic plates or blocks 0and 0 between them, by means of the screws a and a are the screws forsecurely attaching the device to the ceiling or wall of a room or in anyother place where the device is to be put up.

Each plate or block 0 and c is provided with a suitable hole in which Iarrange the ends d and d of a very fine wire d, of any suitable metal,having great strength and capable of ready expansion when exposed to anordinary rise in the temperature, which wire when suitably stretched issecured in said holes in the said plates or blocks 0 and c by means ofsuitable set-screws 0 To prevent the points of said screws from cuttingor breaking the ends of the said fine wire (1 when the screws are firmlyscrewed down, I may arrange in said holes in the plates or blocks 0 andc in position between the fine wire (1 and the ends of the screws smallpieces or plates, as c, which act as protector-plates against the actionof the screw-points against the fine wire.

As will be more especially seen from Fig. 6, the bar a of the deviceA isprovided at its central point with an electric contact or post c andscrew 6, adapted to receive the other end of the circuit-wire g, inwhich I have arranged a battery 9 and an electric alarmbell 9 as clearlyillustrated in Fig. 1.

In an opening a in the bar a I have arranged a contact-screw h, which isscrewed into the post 0, as shown in Fig. 6, and in an opening a in thebar a is a screw 72 which screws into the back of the post 6 said screws7L and 7t respectively securing said posts 6 and e in their operativepositions on the bars a and a, substantially as illustrated. (lonnectedwith the said screw it by means of a loop or eye 2" is a suitablecontact-spring t, preferably made of phosphor-bronze, provided with acoil 1' and an arm i said arm having a flattened end i, which ispreferably provided with a platinum contact '6 Said flattened end i isbent at a suitable angle, as at i, and has a hole or perforation i,through which the wire d passes, as clearly illustrated in Fig. i.

Extending from one side of the contactpost c to a point directly abovethe flattened end i of said spring 1' is a bar 6, and in ascrew-threaded hole in said bar is an adjustable screw a which acts as acontact, and preferably has a platinum contact-point on its free end.lVhensaid portion 1' of the spring 2' is in contact with the end of saidscrew c then a complete circuit will be cstablishcd through the severalparts of the device A and the circuit g, whereby an alarm will besounded by the electric bell as will be clearly understood.

Under normal conditions the wire cl is contracted and very taut, and thewire passing through the perforated end 2' of the spring 1' said end ofthe spring will be out of electrical contact with the screw 0 and themain circuit will of course be broken; but as soon as there is anincrease of temperature the wire (Z will expand, which allows the coilsi of the spring 'i to act and bring the contact portion of the end i" ofthe spring 1' into operative electrical contact with the screw 0', withthe result hereinabove mentioned.

The operation of the parts is clear and very simple, and acircuit-closer is the result which is very useful for many purposes.

Of course it will be understood that the device can be made to work atdifferent temperatures by means of the regulating-screw c, which can bebrought farther away or closer to the contacting surface of the spring'r' by turning the screw in said bar c, as will be clearly understood.

Having thus described my invention, what I claim is- 1.Theherein-described circuit-closer,comprising, in combination, with anopen frame, a fine metallic wire stretched in said frame, a pair ofelectrical contacts in said frame, and a spring in said frame, saidspring having a perforated contact end portion, through which said wirepasses, to normally force said spring out of contact with one oisaidelectrical contacts on said frame, substantially as and for the purposesset forth.

2. The herein-described circuit-closer,eomprising, in combination, withan open frame, a fine metallic wire stretched in said frame, acontact-post e, a screw it connected with said post, a spring in saidframe, said spring hav ing a perforated contact end portion, throughwhich said wire passes, and a contact-post and a contactscrew, withwhich said spring is adapted to make contact, substantially as and forthe purposes set forth.

3. The hereiirdescribed circuit-closer,comprising in combination, with apair of bars a and a, metallic blocks 0 and 0' between said bars and afine wire connected with said blocks, a pair of electrical. contacts,one on each bar a and a, and a spring connected with one of said bars,said spring having a perforated contact end portion,through which saidwire passes, to normally force said spring out of contact with one ofsaid electrical contacts, substantially as and for the purposes setforth.

. l. The herein-described circuit-closer,eomprising, in combination,with a pair of bars 1/ and a, metallic blocks 0 and 0 between said barsand a fine wire connected with sai d blocks, a contact-post c on saidbar a, a screw 71. connected therewith, a spring connected with said bar(4, having a perforated contact end portion, through which said wirepasses, a contact-post c on said bar a and a contactscrew 0 with whichsaid spring is adapttal to make contact, substantially as and for thepurposes set forth.

5. The herein-described circuit-closer, con sisting, essentially, of apair of bars a and a, metallic blocks 0 and 0' between said bars, a finewire connected with. said blocks, and a spring 1' between said bars,said spring having a perforated contact end portion, through which saidwire passes, and a contact on one of said bars, with which said springis adapted to make contact, substantially as and for the purposes setforth.

6. The herein-described circuit'closer, consisting, essentially, of apair of bars a and a, metallic blocks 0 and 0 between said bars, a finewire connected with said blocks, a contact-post c on said bar (I, acontaet-screw 72 connected with said post c, a contaetpost (5 on saidbar a, a bar c connected therewith, a contact-screw c on said bar c",and a contactspring connected with said screw 70, said sprin having aperforated contact end portion, through which said wire passes,substantially as and for the purposes set forth.

7. The herein-describcd circuit-closcr, consisting, essentially, of apair of bars a. and a, metallic blocks c and a between said bars, afinewirc connected with said blocks,a contactpost e on said bar a, acontact-screw it connect; ed with said post c, a eontactpost c on saidbar a, a bar 6 connected therewith, a contact- Signed at Newark, in thecounty of Essex I screw 6 on said bar 6 and a contact-spring and Stateof New Jersey, this 23d day of connected with said screw h, said springhav- March, A. D. 1897.

ingacoiled portion 4?, an arm '6 aflattened end HERMANN RUETSCHI.contact portion 1 and a perforated bent part Witnesses:

'5 through which said Wire passes, snbstan- JOHN H. KNELL,

tially as and for the purposes set forth. CHAS. B. PIERCE.

